If you're in Iowa this week, you'll need to watch out for campaign buses. Several Republican candidates are on bus tours of the state — including former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich.
For Gingrich, it's something of a comeback tour. After leading in the polls, he's had setbacks in recent days. Negative campaign ads by his opponents have hurt him with some voters. And news stories have raised questions on everything from his health-care stance to his first divorce, more than 30 years ago.
